[RCU] LDAP address book - problem with groups

Hi, new to Roundcube, I have still some confusion about configuring the LDAP address book. Please, is somewhere a little detailed description of the configuration scenarios and individual options?

Now I have something as this (found somewhere on the net):

$config['ldap_public']['public'] = array( 'name' => 'Public LDAP Addressbook', 'hosts' => array('ldap.mydomain'), 'base_dn' => 'o=spse', 'bind_dn' => 'cn=binduser,o=myorg', 'bind_pass' => 'binduseracces', 'filter' => '(&(objectClass=inetOrgPerson)(cn=z*))', 'sort' => 'sn', 'global_search' => true, 'fuzzy_search' => true, 'groups' => array( 'base_dn' => '', 'mail' => '{Mail-Address}@mydomain.com', 'filter' => '(&(objectClass=groupOfNames)(Mail-Address=*))', 'object_classes' => array("top", "groupOfNames"), 'class_member_attr' => array( 'groupofnames' => 'member', 'groupofuniquenames' => 'uniquemember' ), ), 'name_field' => 'uid', 'email_field' => 'mail', 'surname_field' => 'sn', 'firstname_field' => 'givenName', 'scope' => 'sub' );

and although as I understand the description for individual people, I do not even understand the description of groups - whole this block:

'groups'            => array(
    'base_dn'         => '',
    'mail'            => '{Mail-Address}@mydomain.com',
    'filter'          => '(&(objectClass=groupOfNames)(Mail-Address=*))',
    'object_classes'  => array("top", "groupOfNames"),
    'class_member_attr' => array(
      'groupofnames'       => 'member',
      'groupofuniquenames' => 'uniquemember'
    ),
),

• why it is included just where it is?
• what is meant by:

'object_classes' => array("top", "groupOfNames"),

? what is block:

    'class_member_attr' => array(
      'groupofnames'       => 'member',
      'groupofuniquenames' => 'uniquemember'
    ),

In spite of all the confusion, RC puts something out. But what bothers me and I need to have it differently:

• when in new mail I write recipient address, autocompletion offers me

the required group. But when I click on it, in the address bar appears no single address (groupname@mydomain), but mail addresses of all group members! What with this?

• in address book menu, I want to display group names (as is now), but

not their members (or at least not to all RC users). Is this possible somehow?

I'm trying Roundcube version 1.3.4, LDAP DB is some commercial one with schema roughly corresponding with Openldap core, and groups are defined as:

dn: cn=_groupName_,ou=Groups,o=myorg Mail-Address: _groupName_ objectClass: groupOfNames objectClass: Top objectClass: Mail-Group member: cn=_user1_,ou=XX,o=myorg member: cn=_user2_,ou=YY,o=myorg ... cn: _groupName_

(there isn't complete mail address - only part before '@'. All groups in addressbook are in one domain)

Thanks in advance for your help! Franta Hanzlik